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      <regFileNumber>811-04815</regFileNumber>
      <regCik>0000732697</regCik>
      <regLei>254900JPNAJ16VJV5X45</regLei>
      <regStreet1>550 SCIENCE DRIVE</regStreet1>
      <regCity>MADISON</regCity>
      <regStateConditional regCountry="US" regState="US-WI"/>
      <regZipOrPostalCode>53711</regZipOrPostalCode>
      <regPhone>608-274-0300</regPhone>
      <seriesName>Conservative Allocation Fund</seriesName>
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      <repPdEnd>2024-12-31</repPdEnd>
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    <signature>
      <ncom:dateSigned>2024-10-15</ncom:dateSigned>
      <ncom:nameOfApplicant>ULTRA SERIES FUND</ncom:nameOfApplicant>
      <ncom:signature>Greg Hoppe</ncom:signature>
      <ncom:signerName>Greg Hoppe</ncom:signerName>
      <ncom:title>Chief Financial Officer</ncom:title>
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</edgarSubmission>
